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94c207e097
Commit 8629910955a7 ("Add thread_db_notice_clone to gdbserver")
introduced calls into libthread_db without making sure that the
current thread is pointing to a know-stopped thread. This resulted in
sometimes thread_db_notice_clone failing->find_one_thread failing like
this, as seen when running gdb.threads/multi-create-ns-info-thr.exp:
~~~
Thread <6> executing
Thread <7> executing
gdbserver: PID mismatch! Expected 27472, got 27471
gdbserver: Cannot find thread after clone.
Thread <1000> executing
Thread <1001> executing
~~~
Things go south from here and sometimes that ends up resulting in
gdbserver crashing and the test failing.
gdb/gdbserver/ChangeLog:
2017-09-29 Pedro Alves <palves@redhat.com>
* linux-low.c (handle_extended_wait): Pass parent thread instead
of process to thread_db_notice_clone.
* linux-low.h (thread_db_notice_clone): Replace parent process
parameter with parent thread parameter.
* thread-db.c (find_one_thread): Add comment.
(thread_db_notice_clone): Replace parent process parameter with
parent thread parameter. Temporarily switch to the parent thread.
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